package com.xxl.job.core.util;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import com.xxl.job.core.log.XxlJobLogger;

/**
 * 1、内嵌编译器如"PythonInterpreter"无法引用扩展包，因此推荐使用java调用控制台进程方式"Runtime.getRuntime().exec()"来运行脚本(shell或python)；
 * 2、因为通过java调用控制台进程方式实现，需要保证目标机器PATH路径正确配置对应编译器； 3、暂时脚本执行日志只能在脚本执行结束后一次性获取，无法保证实时性；因此为确保日志实时性，可改为将脚本打印的日志存储在指定的日志文件上；
 * 4、python 异常输出优先级高于标准输出，体现在Log文件中，因此推荐通过logging方式打日志保持和异常信息一致；否则用prinf日志顺序会错乱 Created by xuxueli on 17/2/25.
 */
public final class ScriptUtil {

	/**
	 * make script file
	 * @param scriptFileName
	 * @param content
	 * @throws IOException
	 */
	public static void markScriptFile(String scriptFileName, String content) throws IOException {
		// make file,   filePath/gluesource/666-123456789.py
		FileOutputStream fileOutputStream = null;
		try {
			fileOutputStream = new FileOutputStream(scriptFileName);
			fileOutputStream.write(content.getBytes("UTF-8"));
			fileOutputStream.close();
		} catch (Exception e) {
			throw e;
		} finally {
			if (fileOutputStream != null) {
				fileOutputStream.close();
			}
		}
	}

	/**
	 * 脚本执行，日志文件实时输出
	 * @param command
	 * @param scriptFile
	 * @param logFile
	 * @param params
	 * @return
	 * @throws IOException
	 */
	public static int execToFile(String command, String scriptFile, String logFile, String... params) throws IOException {
		FileOutputStream fileOutputStream = null;
		Thread inputThread = null;
		Thread errThread = null;
		try {
			// file
			fileOutputStream = new FileOutputStream(logFile, true);
			// command
			List<String> cmdarray = new ArrayList<>();
			cmdarray.add(command);
			cmdarray.add(scriptFile);
			if (params != null && params.length > 0) {
				for (String param : params) {
					cmdarray.add(param);
				}
			}
			String[] cmdarrayFinal = cmdarray.toArray(new String[cmdarray.size()]);
			// process-exec
			final Process process = Runtime.getRuntime().exec(cmdarrayFinal);
			// log-thread
			final FileOutputStream finalFileOutputStream = fileOutputStream;
			inputThread = new Thread(() -> {
				try {
					copy(process.getInputStream(), finalFileOutputStream, new byte[1024]);
				} catch (IOException e) {
					XxlJobLogger.log(e);
				}
			});
			errThread = new Thread(() -> {
				try {
					copy(process.getErrorStream(), finalFileOutputStream, new byte[1024]);
				} catch (IOException e) {
					XxlJobLogger.log(e);
				}
			});
			inputThread.start();
			errThread.start();
			// process-wait
			int exitValue = process.waitFor();      // exit code: 0=success, 1=error
			// log-thread join
			inputThread.join();
			errThread.join();
			return exitValue;
		} catch (Exception e) {
			XxlJobLogger.log(e);
			return -1;
		} finally {
			if (fileOutputStream != null) {
				try {
					fileOutputStream.close();
				} catch (IOException e) {
					XxlJobLogger.log(e);
				}
			}
			if (inputThread != null && inputThread.isAlive()) {
				inputThread.interrupt();
			}
			if (errThread != null && errThread.isAlive()) {
				errThread.interrupt();
			}
		}
	}

	/**
	 * 数据流Copy（Input自动关闭，Output不处理）
	 * @param inputStream
	 * @param outputStream
	 * @param buffer
	 * @return
	 * @throws IOException
	 */
	private static long copy(InputStream inputStream, OutputStream outputStream, byte[] buffer) throws IOException {
		try {
			long total = 0;
			for (;;) {
				int res = inputStream.read(buffer);
				if (res == -1) {
					break;
				}
				if (res > 0) {
					total += res;
					if (outputStream != null) {
						outputStream.write(buffer, 0, res);
					}
				}
			}
			outputStream.flush();
			//out = null;
			inputStream.close();
			inputStream = null;
			return total;
		} finally {
			if (inputStream != null) {
				inputStream.close();
			}
		}
	}
	/**
	 * 脚本执行，日志文件实时输出 优点：支持将目标数据实时输出到指定日志文件中去 缺点： 标准输出和错误输出优先级固定，可能和脚本中顺序不一致 Java无法实时获取 <!-- commons-exec -->
	 * <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-exec</artifactId>
	 * <version>${commons-exec.version}</version> </dependency>
	 * @param command
	 * @param scriptFile
	 * @param logFile
	 * @param params
	 * @return
	 * @throws IOException
	 */
	/*public static int execToFileB(String command, String scriptFile, String logFile, String... params) throws IOException {
	    // 标准输出：print （null if watchdog timeout）
	    // 错误输出：logging + 异常 （still exists if watchdog timeout）
	    // 标准输入

	    FileOutputStream fileOutputStream = null;   //
	    try {
	        fileOutputStream = new FileOutputStream(logFile, true);
	        PumpStreamHandler streamHandler = new PumpStreamHandler(fileOutputStream, fileOutputStream, null);

	        // command
	        CommandLine commandline = new CommandLine(command);
	        commandline.addArgument(scriptFile);
	        if (params!=null && params.length>0) {
	            commandline.addArguments(params);
	        }

	        // exec
	        DefaultExecutor exec = new DefaultExecutor();
	        exec.setExitValues(null);
	        exec.setStreamHandler(streamHandler);
	        int exitValue = exec.execute(commandline);  // exit code: 0=success, 1=error
	        return exitValue;
	    } catch (Exception e) {
	        XxlJobLogger.log(e);
	        return -1;
	    } finally {
	        if (fileOutputStream != null) {
	            try {
	                fileOutputStream.close();
	            } catch (IOException e) {
	                XxlJobLogger.log(e);
	            }

	        }
	    }
	}*/
}
